I love this beautiful defuser! It arrived nicely packaged, and was very easy to set up. Just add water to the easy to see fill line, and then add a couple drops of essential oils.  The battery is chargeable and it has two settings: continuous or intermittent.  It claims to work for 8 hours on the intermittent setting, but I haven't left it on for that long yet. I can say it runs for as long as I need it, and not having a cord means I can place it anywhere I like!